Add files and folders to gitignore

Eclispe and gradle files and folders
Little changes to build.gradle
Change "terasologyLauncher" into lowercase
Technical commit for lowercase
Technical commit for lowercase
JUnit Test
Merge pull request #1 from mkalb/styleAndStructure

Gradle, gitignore and package name
Some minor tweaks and fixes:
 - removed useless Download.java
 * moved Starter to launcher package and fixed JVM Args
 * excluded mods/ from deleted directories
* Fix for JVM Args fix :/
+ constants for folder names
* typo in TerasologyStarter
Merge pull request #2 from skaldarnar/develop

Some minor tweaks and fixes: